Unit 4, Lesson 9# Analyze different rectangles and reason about their area

EngageNY 50 min(s)

In this lesson, students cut apart rectangular grids and rearrange the parts to create new rectangles with the same area. They conclude that area is additive: a 10-cm by 10-cm rectangle, for example, has the same area as two 5-cm by 10-cm rectangles, or five 2-cm by 10-cm rectangles.